How did you put the ISO onto the flash drive? Which commands or software did you use to unpack the ISO? Did you use dd/pv or something like Balena Etcher?
I recommend Ventoy.
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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How did you put the ISO onto the flash drive? Which commands or software did you use to unpack the ISO? Did you use dd/pv or something like Balena Etcher?
I recommend Ventoy.
To explain more, an understandable and common mistake is to just move the .iso file to the flash drive. For it to work you have to write the information contained in the .iso file (aka image) to the flash drive using an app like the ones listed above.
Probably the priority list in the BIOS has another drive set as the one to boot, find one whixh key to press to go to the bios on your pc, go and find the boot list.
Could you further clarify what steps you're taking, and what you're seeing happen?